i snagged this off another forum... but its a good
chat about why my round ports own your slot ports!!!
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The only things I ever really took into consideration, besides it fitting in the box and how it looks, are the things I thought were necessary like tuning freq, turbulence, and what not.....
well see.. the whole thing is the air that is closest to the edges of the port, are going to suffer from resistence/friction(or is it drag?) known as laminate air. Basically, its going to move/flow slower than the air that is further away from the edges and closer to the center of the port.
normally you'd think, oh well thats good, lower air speed in the port... HOWEVER, remember, we still got that sub pounding away, and DISCLAIMER!!! "I may be wrong" but... i believe this causes the air in the center to move faster.
anyways... point being, however it works, if you have lots of surface area, in your port, you are going to have a harder time with port noise/port velocity. thats when somebody came up with the 9:1 ratio a square has less surface area with the same sq area as a rectangle does... think about it
square is 4x4 = 16sq in of port/area
rectangle is 8x2 = 16sq in of port/area
HOWEVER, the parimeter (which is the same as the surface area in a port) is differen't
square = 4+4+4+4 = 16
rectangle = 8+2+8+2 = 20
see the difference? now can you imagine a port that was something like 12x1.33 or even 16x1... we're talking 26.66 and 34!!! the bigger the ratio is, the worse the difference is.
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So basically you are saying the squarer the better, and when it comes down to it, round > all.
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So basically you are saying the squarer the better, and when it comes down to it, round > all.
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hmmm yeah.. i believe round is the best.... hmm a circle with 16sq area is something like 2.26 radius = 4.52" round circle... and has a perimeter of... 7.09
so yep... circle is the best, my figures are not accurate... they are slightly off due to the nature of Pi and its horrible never ending decimal.... but they are close.
so yeah....round ports, especially flared ports like aeroports are the best when it comes to port noise
